package com.webserver.core;

import com.webserver.http.HttpRequest;

import java.io.*;
import java.net.Socket;
import java.util.HashMap;
import java.util.Map;

/**
 * 处理与指定客户端的一次HTTP交互
 * 完成一次交互由三步构成:
 * 1:解析请求
 * 2:处理请求
 * 3:响应客户端
 */
public class ClientHandler implements Runnable {
    private Socket socket;

    public ClientHandler(Socket socket) {
        this.socket = socket;
    }

    public void run() {
        try {
            //1解析请求
            HttpRequest request = new HttpRequest(socket);

            /*
               http://localhost:8088/myweb/index.html
               http://localhost:8088/myweb/classTable.html
             */
            //2处理请求
            String path = request.getUri();
            File file = new File("./webapps"+path);
            //3发送响应
            /*
               HTTP/1.1 200 OK(CRLF)
               Content-Type: text/html(CRLF)
               Content-Length: 2546(CRLF)(CRLF)
               1011101010101010101......
             */
            OutputStream out = socket.getOutputStream();
            //3.1:发送状态行
            String line = "HTTP/1.1 200 OK";
            byte[] data = line.getBytes("ISO8859-1");
            out.write(data);
            out.write(13); //发送一个回车符
            out.write(10); //发送一个换行符

            //3.2:发送响应头
            line = "Content-Type: text/html";
            data = line.getBytes("ISO8859-1");
            out.write(data);
            out.write(13); //发送一个回车符
            out.write(10); //发送一个换行符

            line = "Content-Length: "+file.length();
            data = line.getBytes("ISO8859-1");
            out.write(data);
            out.write(13); //发送一个回车符
            out.write(10); //发送一个换行符

            //单独发送CRLF表示响应头发送完毕
            out.write(13); //发送一个回车符
            out.write(10); //发送一个换行符

            //3.3:发送响应正文
            FileInputStream fis = new FileInputStream(file);
            data = new byte[1024*10];//10kb
            int len; //每次实际读取到的字节数量
            while((len = fis.read(data))!=-1){
                out.write(data,0,len);
            }
            System.out.println("响应发送完毕");

            /*
               上述内容写好后，打开浏览器输入网址: http://localhost:8088/index.html
               测试读取浏览器发送过来的请求内容并在控制台上确认内容
             */
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //一次HTTP交互完毕后要与客户端断开连接(HTTP协议要求)
            try {
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}
